package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//@Order(-1)
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取请求参数
        MultiValueMap<String, String> params = exchange.getRequest().getQueryParams();
        //2.获取authorization参数
        String auth = params.getFirst("authorization");
        //3.效验
        if ("admin".equals(auth)){
            // 放行
            return chain.filter(exchange);
        }
        //4.拦截
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED); // Restful格式的返回值401未登录
        //5.结束处理
        return exchange.getResponse().setComplete();
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
